CYK512K16SCCA
MoBL
廬
8-Mbit (512K x 16) Pseudo Static RAM
Features
鈥?Advanced low-power MoBL
廬
architecture
鈥?High speed: 55 ns, 70 ns
鈥?Wide voltage range: 2.7V to 3.3V
鈥?Typical active current: 2 mA @ f = 1 MHz
鈥?Typical active current: 11 mA @ f = f
MAX
鈥?Low standby power
鈥?Automatic power-down when deselected
Functional Description
[1]
The CYK512K16SCCA is a high-performance CMOS pseudo
static RAM (PSRAM) organized as 512K words by 16 bits that
supports an asynchronous memory interface. This device
features advanced circuit design to provide ultra-low active
current. This is ideal for providing More Battery Life鈩?(MoBL)
in portable applications such as cellular telephones. The
device can be put into standby mode reducing power
consumption dramatically when deselected (CE
1
LOW, CE
2
HIGH or both BHE and BLE are HIGH). The input/output pins
(I/O
0
through I/O
15
) are placed in a high-impedance state
when: deselected (CE
1
HIGH, CE
2
LOW), OE is deasserted
HIGH, or during a write operation (Chip Enabled and Write
Enable WE LOW). Reading from the device is accomplished
by asserting the Chip Enables (CE
1
LOW and CE
2
HIGH) and
Output Enable (OE) LOW while forcing the Write Enable (WE)
HIGH. If Byte Low Enable (BLE) is LOW, then data from the
memory location specified by the address pins will appear on
I/O
0
to I/O
7
. If Byte High Enable (BHE) is LOW, then data from
memory will appear on I/O
8
to I/O
15
. See the Truth Table for a
complete description of read and write modes.
Logic Block Diagram
DATA IN DRIVERS
A
10
A
9
A
8
A
7
A
6
A
5
A
4
A
3
A
2
A
1
A
0
ROW DECODER
512K x 16
RAM Array
SENSE AMPS
I/O
0
鈥揑/O
7
I/O
8
鈥揑/O
15
COLUMN DECODER
BHE
WE
OE
BLE
BHE
BLE
CE
2
CE
1
CE
2
CE
1
Note:
1. For best-practice recommendations, please refer to the Cypress application note 鈥淪ystem Design Guidelines鈥?on http://www.cypress.com.
A
11
A
12
A
13
A
14
A
15
A
16
A
17
A
18
Pow
-
er Down
Circuit
Cypress Semiconductor Corporation
Document #: 38-05425 Rev. *E
鈥?/div>
3901 North First Street
鈥?/div>
San Jose
,
CA 95134
鈥?/div>
408-943-2600
Revised January 25, 2005
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